INVESTIGATION OF IONOSPHERIC OBLIQUE SOUNDER DATA.
Scientific rept. no. 1,
DECO ELECTRONICS CAMBRIDGE MASS
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During October and November 1962 simultaneous vertical HF ionospheric soundings were taken at Midway, Johnston and Palmyra Islands. This report uses the observed vertical soundings to predict oblique propagation by means of four methods for the Midway-Palmyra path 3000 km. The first two transmission curve methods predicted MUF results which averaged four percent higher than observed. The third and fourth methods predicted MUF by means of ray tracing on an analog computer with the Hamilton ray equations. The third method used the electron density at path midpoint only and predicted results which averaged eight percent higher than observed. The fourth method used electron density interpolated between the path end-points and midpoints to predict results which were one percent higher than observed. Additionally, differential path delays were computed and compared to observations. Some estimates were also made of absorption over the ray path. Author